feat(admin): items_base browser and AdminPageShell on core pages

Co-authored-by: Cursor <[email protected]>

src/lib/staff-smoke-contract.test.ts

@@ -82,4 +82,15 @@ describe("staff smoke contract", () => {
 			expect(readFileSync(path, "utf8"), path).toContain("TicketQueueBanner");
 		}
 	});
+
+	it("ships items_base browser", () => {
+		expect(existsSync("src/app/admin/items/page.tsx")).toBe(true);
+		expect(existsSync("src/app/admin/items/[id]/page.tsx")).toBe(true);
+		expect(readFileSync("src/actions/items-base.ts", "utf8")).toContain(
+			"updateItemsBase",
+		);
+		expect(readFileSync("src/lib/admin-nav.ts", "utf8")).toContain(
+			"/admin/items",
+		);
+	});
 });